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求20.5*0.12的最简便算法

原式 =0.5x0.3x0.12+0.5x1 =0.5x0.036+0.5x1 =0.5x(0.036+1) =0.5x1.036 =0.518

12×1.5表示求12的1.5倍 12×0.5表示求12的一半

(0.25*0.4)*(0.8*0.125)等于0.1*0.1等于0.01

(8+0.08)×12.5=8×12.5+0.08×12.5=100+1=101

12.5*0.8=10 10*9.6=96

12.5×0.23×25 = 12.5×2.3×2.5 = 12.5×(2.4-0.1)×(2.4+0.1) = 12.5×(2.4²-0.1²) = 2×2.5²×(2.4²-0.1²) = 2×2.5²×2.4²-2×2.5²×0.1² = 2×(2.5×2.4)² - 12.5×0.01 = 2×6² - 0.125 = 72 - 0....

4.6*12.5*3*0,8 =(4.6x3)x(12.5x0.8) =13.8x10 =138

27 解: 12.5×2.7×0.8 =(12.5×0.8)×2.7 =10×2.7 =27

12.5x0.32x0.5 =12.5x0.8x0.4x0.5 =10x0.2 =2

1.28-(0.18+3.5×0.12) =1.28-(0.18+0.42) =1.28-0.6 =0.68

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